package com.sky.aspect;


import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper..*.*(..))&& @annotation(com.sky.annotation.AutoFill)")
    public  void pointCut(){
    }
    /**
     * 前置通知，公共字段填充
     */
    @Before("pointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始公共字段填充");
        //获取到当前被拦截的方法的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature(); //方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class); //获取方法上的注解对象
        OperationType operationType = autoFill.value();  //获取数据库操作类型

        //获取当前被拦截的方法参数 --实体对象
        Object[] args = joinPoint.getArgs();
        if(args == null && args.length == 0){
            return;
        }
        Object entity = args[0];
        //准备赋值数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //根据不同操作类型，为对应字段赋值
        if(operationType == OperationType.INSERT){
            try {
                //四个字段赋值
                Method setCreatTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreatUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setCreatTime.invoke(entity,now);
                setCreatUser.invoke(entity,currentId);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }else if(operationType == OperationType.UPDATE){
                try {
                    //两个字段赋值
                    Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                    Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                    setUpdateTime.invoke(entity,now);
                    setUpdateUser.invoke(entity,currentId);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }


    }
}
